Thats a good idea - I must try it. I have just come back home a week ago after spending July and August riding my bike around France. Whilst there I was relying on taking those little muesli bars (useful for when you are on the bike for a whole day as when cycle touring) and sugar cubes for moments of exhaustion.

I got the sugar cubes idea after watching the French cyclists using them, but they are not that pleasant to eat.